Use tighter typing in editing: CompositeEditCommand

Source/core/editing/htmlediting.cpp

Index: Source/core/editing/htmlediting.cpp
diff --git a/Source/core/editing/htmlediting.cpp b/Source/core/editing/htmlediting.cpp
index d8341a3f6fd2aa74970860a3b02003720dd3a323..8b5e040f7fb0d12d1e820f6ee2dadde554a62a8c 100644
--- a/Source/core/editing/htmlediting.cpp
+++ b/Source/core/editing/htmlediting.cpp
@@ -800,7 +800,7 @@ PassRefPtrWillBeRawPtr<HTMLElement> createDefaultParagraphElement(Document& docu
     return nullptr;
 }
 
-PassRefPtrWillBeRawPtr<HTMLElement> createBreakElement(Document& document)
+PassRefPtrWillBeRawPtr<HTMLBRElement> createBreakElement(Document& document)
 {
     return HTMLBRElement::create(document);
 }
@@ -876,6 +876,11 @@ PassRefPtrWillBeRawPtr<HTMLSpanElement> createTabSpanElement(Document& document)
     return createTabSpanElement(document, PassRefPtrWillBeRawPtr<Text>(nullptr));
 }
 
+PassRefPtrWillBeRawPtr<HTMLBRElement> createBlockPlaceholderElement(Document& document)
+{
+    return toHTMLBRElement(document.createElement(brTag, false).get());
+}
+
 bool isNodeRendered(const Node *node)
 {
     if (!node)